﻿// Copyright 2008 Chris Varley (http://www.contractdriven.net/)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

using System;
using System.Runtime.Remoting.Activation;
using System.Runtime.Remoting.Contexts;
using System.Security.Permissions;

namespace ContractDriven.Aspects
{

	/// <summary>
	/// Sets up a context for evaluating Invariant Contract Assertions.
	/// </summary>  
    [SecurityPermission(SecurityAction.InheritanceDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
	[AttributeUsage(AttributeTargets.Class)]
    public sealed class InvariantAttribute : ContextAttribute
    {
        [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
        public InvariantAttribute() : base("Invariant") { }

		/// <summary>
		/// Adds a new InvariantProperty to the current remoting context before the constructor is called.
		/// </summary>
        [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.Infrastructure)]
        public override void GetPropertiesForNewContext(IConstructionCallMessage ccm)
        {
            ccm.ContextProperties.Add(new InvariantProperty());
        }
    }

}
